Muscles are made of different types of ______, as they occupy the _____ level of organization

Muscles are divided into bundles of muscle fibers called _____ by membranes called ____

muscle fibers, representing the ____ level of organization, are separated from one another by

within the muscle fibers are bundles of myofilaments called ____, which represent the ____ level of organization

myofibrils are surrounded by saclike organelles simmilar to ER called ______

___, along with their two adjoining terminal cisternae (of the SR) make up the -Triad-

The transverse tubules and Sarcoplasmic Reticulum are involved in

The thick filaments are made exclusively of ___ while the thin filaments are mostly ____

Contractile units called _____ shorten when thick and thin filaments slide along one another

The ends of the sarcomere are pulled together by the action of _____ heads attaching to ____ binding sites

To initiate contractile shortening of the sarcomere, ___ is released from the sarcoplasmic reticulum to remove ___ from the binding sites on the thin filaments

to reset the myosin heads so that they can attach to the actin again requires

The aligned z-discs on adjacent microfibrils create the visible ___ in skeletal muscle

A group of muscle fibers that are all innervated by the same motor neuron are called

muscle fibers contract

one way to increase the tension of muscle contraction is by increasing the ____ of the stimulus, in a process of TEMPORAL SUMMATION

tension in a muscle can also be increased by recruiting additional motor units in a process called

In the muscles of the calf and lower back, ___ fibers predominate

in the muscles that move the eye and eyelid, one finds almost all of the fibers are

muscles attach to the relatively immobile point at the ___, and to the relatively mobile point at the ___

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